JPH05212996A - Method for inspecting bond with safety wire embeded - Google Patents

Abstract

PURPOSE: To test the authenticity of a security document by passing the security document through an inspection device at a certain speed and under the condition in which a security thread becomes vertical to the transport direction, by detecting the physical properties of individual areas and their changes with the passage of time and by determining the geometrical distribution of various areas of the security thread based on the testing signals coming from these areas. CONSTITUTION: Inside a security document 37, a security thread 4 is embedded, which can be confirmed visually by either reflected light or transmitted light and which has particular physical properties detectable mechanically. The said security document 37 is passed through an inspection device 42 at a certain speed and under the condition in which the security thread 4 becomes vertical to the transport direction. When the security document 37 passes through the inspection device 42, physical properties and their changes with the passage of time in individual areas of the security thread 4 are detected by using one or more sensors. Then, based on the testing signals coming from various areas of the security thread 4, the geometrical distribution of these areas are determined and compared with the prescribed values. As a result, a security thread hardly reproducible for a counterfeiter can be inspected promptly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security document in which a security wire having a specific physical property which can be visually confirmed by both reflected light and transmitted light and which can be detected by a machine is embedded. It relates to the inspection method.

[0002]

2. Description of the Related Art Conventionally, it is known to prevent forgery by providing a so-called "safety line" on securities such as securities and ID cards. When manufacturing a security, a safety strip is placed inside the sheet of the security during the sheet forming process. The safety line is usually buried so as to be safely surrounded by the constituent fibers of the security (UK patent 8242 (193).
9), West German Utility Model Registration No. 7218681).

It is also known to manufacture a security in which the safety wire is partially exposed to the outside so that it can be viewed directly from the outside (West German Patent Publication No. 2743019). The specific optical properties of the safety line can be fully and easily examined by embedding the safety line in this way. West German Patent Publication No. 2156888
The gazette also discloses, inter alia, a network of thermoplastic filaments or the insertion of individual filaments into a security. As the thermoplastic substance, one having a melting point of 160 ° C. or lower is used.

In order to verify the authenticity of a security lined security note, inspection is usually performed for the presence and location of the security stripes in the security note by looking at the reflected or transmitted rays. The glued or inscribed safety lines can thus be very easily distinguished from the genuine safety lines put in during manufacture.

In the case of a counterfeit security which has a security line glued between the two already manufactured layers of the security, it is virtually the same as the security with the security line in place. is there. However, such counterfeits can be easily discriminated from genuine banknotes by the difference in paper quality (hardness, tearability, etc.) and the difference in "touch".

It is also known to make it possible to mechanically inspect a safety line by using a safety line having specific physical properties which can be mechanically detected by a suitable inspection device. There is. Such a safety line is, for example,
As a physical property, it is a filament having specific magnetic and electrical properties or fluorescent properties (West German Patent No. 16962).
45, U.S. Pat. No. 2,143,406).

Therefore, the inspection of the publicly known securities having a safety line usually determines whether or not the security line is embedded and, as a second step, whether the security line has the required physical characteristics. Visual and / or mechanical inspection to see if.

[0008]

The safety line is by definition assumed to be locating without the use of any device and is relatively easy to remove from a security, possibly without destroying it. Since they can be removed, those safety lines are particularly exposed to analytical attacks.

[0009] Therefore, in order to counteract counterfeiting very well, not only must the safety strip have special physical characteristics and be finely embedded in the security, but preferably the safety strip itself. There was a problem that it had to be a delicate one that was difficult for a counterfeiter to reproduce.
Moreover, such requirements must not interfere with the economical industrial production of safety lines.

Therefore, the present invention is intended to solve the above-mentioned conventional problems, and can be mass-produced economically and industrially, and not only can it be inspected by a usual method, but also a safety line. Can also be inspected for specific criteria of
It is an object of the present invention to provide an effective inspection method for a security in which a new security line is buried, which is extremely difficult for a counterfeiter to reproduce.

[0011]

To achieve the above object, the present invention provides a safety wire having specific physical characteristics which can be visually confirmed by both reflected light rays and transmitted light rays and which can be detected by a machine. In a security having a line embedded therein, the safety line is divided into at least two adjacent regions extending in the longitudinal direction thereof, and each region extends over the entire length of the security line and the security. Are arranged in parallel to each other, the respective regions have different physical characteristics which can be visually confirmed and can be detected by a machine, and the respective regions arranged in parallel have a predetermined shape arrangement. According to the detection signal detected based on the physical characteristics of each area. A method for inspecting a security in which a safety wire is embedded so that the security can be measured without destroying the security, and the security wire is at a constant speed and the security wire is perpendicular to the conveying direction. Passing through the inspection device in such a state that one or more sensors are used to detect the physical characteristics of each region of the safety wire and their appearance over time when passing the security inspection device. And the process of
Determining the geometrical arrangement of these regions based on the inspection signals coming from the various regions of the safety line and comparing them with a predetermined value.

It is characterized in that a plurality of sensors arranged on a line parallel to the safety line are used to detect physical properties of various regions of the safety line.

A step of confirming the position of the security using a position detector when passing through the security inspection device; a predetermined physical property using at least two sensors capable of detecting the same physical characteristic. Comparing the appearance of the test signal provided by the sensor over time with a predetermined value in relation to the signal provided by the position detector. To do.

Confirming the presence of a given physical property using at least two sensors capable of detecting the same physical property; when there is a difference in the temporal order of the test signals coming from said sensors. Generating a correction signal; including the correction signal in determining the geometrical arrangement of the various areas of the safety line.

[0015]

The security lines of the securities to which the inspection method of the present invention is applied are arranged in parallel with each other in a geometrical positional relationship according to a predetermined shape arrangement, and the geometrical positional relationship is visually recognized. It is possible or configured so that it can be measured without destroying the security based on the physical characteristics of each area.

Then, in the inspection of the security, the security is passed through the inspection device at a constant speed and in a state where the safety wire is perpendicular to the conveying direction, and the physical characteristics of each area of the security wire are examined. And the change over time is detected, and based on the inspection signal, the geometrical positional relationship of those areas is determined and compared with a predetermined value to verify the authenticity of the security.

As such, the individual regions having different physical properties are arranged in parallel on the surface of the security so that they can be detected independently in a series of sequences by scanning one surface of the security and individually. Since the distances between the areas of the area are constant and accurate over the entire safety line, not only the physical properties of the individual areas, but also the width and the distance between them, are the inspection criteria to be detected by the measuring technique. Can be used as

By properly combining different inspection criteria based on different physical properties and their exact geometrical harmony, the labor required of the counterfeiter can be increased many times more, and the inspection device Additional effort spent on can be put to a reasonable extent. Other advantages and advantageous developments of the invention are the object of the claims of embodiment as well as of the following detailed description of the invention with reference to the accompanying drawings.

[0019]

1 shows a security 1 in the form of a banknote having a printed area 2 and an unprinted so-called "white area" 3 with a normal plow. A security line 4 extending parallel to the short side of the bill is embedded inside the security 1.
This safety line 4 has specific physical characteristics that can be visually confirmed by both reflected and transmitted rays and can be detected by a machine.

According to the invention, the safety strip 4 is divided into a plurality of regions which extend homogeneously along its length and which have mechanically detectable physical properties.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, showing a possible sectional shape of the safety wire 4 embedded in the security 1.

That is, the safety wire 4 has at least two adjacent regions extending in the longitudinal direction thereof, as shown in FIG.
It is divided into three areas A, B and C as shown in
The areas A, B and C extend over the entire length of the safety wire 4 and are arranged in parallel to each other with respect to the surface of the security 1.

Each of these areas A, B, C has different physical characteristics that can be visually confirmed and can be detected by a machine. Different physical properties include, for example, spectral radiating power or spectral penetrating power,
The fluorescent characteristics, magnetic and / or electrical characteristics, etc. are made different.

These respective areas A, B and C are provided in the body of the safety wire, that is, in an integrated manner so that they cannot be modified by printing technology. Each area A,
B and C are clearly separated from each other and extend parallel to the longitudinal direction, and are arranged in a clearly and accurately defined correlation with each other. As described above, the respective areas A, B, and C are arranged in a geometrical positional relationship according to a predetermined shape arrangement, and the predetermined geometrical positional relationship can be visually confirmed, or The detection signal, which is detected based on the physical properties, allows the security to be measured without destroying it.

Such a safety line 4 is preferably made by coextrusion known in the plastics art ("Synthesefasern", Vera.
Bela von Kalfai, Verlag Chemie, 1982, No. 124
Through p. 126).

FIG. 3 schematically shows an extrusion head for producing the three-component safety wire shown in FIG. Through the three passages 6a, 6b, 6c, different synthetic resins 8, 9, 10 mixed with different additives and separated by the partition wall 11 are supplied to the extrusion molding head 7. These synthetic resins 8, 9 and 10 are heated to their respective melting points, housed in special supply containers and are simultaneously extruded by pressure from different parts of the die and fused together in the contact area. Depending on the basic die shape, for example, it may have a rectangular or elliptical cross-section, and in this embodiment a multi-component consisting of a single filament divided into three different regions arranged next to each other. Is finally generated.

In this case, polymers having the same melt viscosity at the temperature required for coextrusion and having a high affinity so that the two cross-section halves can be bonded without taking other measures are used. Thus, it is preferable to make the two-component or multi-component safety filament 4 arranged in parallel, which constitutes the safety filament 4. An extender pigment, a coloring pigment, a magnetic pigment, a metal pigment and / or a soluble dye is mixed in advance with the basic substance of the safety line 4 to impart desired physical properties to various regions. At this time, the multi-component safety wire formed directly by the molding head 7 is such that after the safety wire is properly pulled out from the molding head 7, the generation pattern warps or the components do not stick to each other. Hardened by cooling to a degree. It is known that such drawing depends on the type of polymer, the extrusion temperature, the state of arrangement of the die, etc. Therefore, the drawing conditions may be set by appropriately changing those parameters.

The multi-component safety filament thus formed may then be softened by selective heating again, or cooling may be selectively interrupted at certain stages. Over the course of this, other cross-sectional shapes, such as an elliptical cross-section with a small thickness / width ratio to a flat band shape with a very large thickness / width ratio, may be used.

In the safety wire 4 having the above-mentioned structure, the areas A, B and C arranged in parallel are arranged in a geometrical positional relationship according to a predetermined shape arrangement, and the geometrical positional relationship is visually confirmed. At the same time as confirming, the physical characteristics of each area A, B, C are detected by a machine to confirm the authenticity of the security.

The properties of the safety wire 4 are closely linked to its structure and manufacture, and when a forger attempts to regenerate the safety wire 4, an elaborate and special manufacturing for manufacturing the safety wire 4. You have to rely on technology. Then, a plurality of areas A having different physical characteristics of the safety line 4,
Since B and C are locally separated from each other with a specific geometrical positional relationship according to a predetermined shape arrangement, they are highly protected against forgery.

Thus, the counterfeiter must imitate the harmonization of the different physical properties and the exact geometrical relationship of these properties with each other and at the same time embed the security line 4 in the security 1, which is essential. You will encounter three obstacles.

Individual regions A having different physical properties,
Since B and C are arranged in parallel with each other on the surface of the security 1,
By scanning one surface of the security 1, it can be detected independently in a series of orders. In addition, the individual areas A, B,
The physical properties of C as well as the width and the distance between them can be used as test criteria to be detected by the measuring technique.

Furthermore, by properly combining different machine-detectable physical properties of each area A, B, C and different inspection criteria based on the harmony of their exact geometrical relationships, counterfeiters can be The labor required can be increased many times more, and the additional effort expended on the inspection device can be kept within a reasonable range.

There are many possible combinations of the structure and shape of the safety lines, and FIGS. 4 (a) to 4 (j) show some advantageous embodiments. For example, FIGS. 4 (a) and 4 (b) show a cross section of a two-component safety filament divided into two regions A and B, in which the components of each region A and B have different colors and different magnetic characteristics. Alternatively, it has a fluorescent property.

FIGS. 4 (c) and 4 (d) are three-component linear strips divided into three regions A, B, A. Regions A, A appearing as stripes on both side edges can be detected by a machine. It has the same physical properties, with physical properties that are in sharp contrast to region B, which appears as a central stripe. In addition to the characteristics that can be detected by the measurement technique, the coding and arrangement of the regions ABA may be stained so that each region ABA can be easily visually identified. Each area AB
Staining A is the same as coloring and arranging physical properties such as color 1 / color 2 / color 1 in the case of ABC coding, for example. However, visually perceptible coloring does not necessarily have to be consistent with physical characterization, and the physical properties themselves cannot be visually inspected, as is the case for magnetic, conductive, invisible fluorescence properties, for example. Occasionally, it is particularly recommended that the visually recognizable coloring be different from the physical characterization. The reason is that the counterfeiters would imagine that the same physical properties detectable by the machine would be represented by the same color, and would thus reproduce the safety line.

FIGS. 4 (e) and 4 (f) show all three regions A, B,
3 shows a three-component safety line with different physical properties of C. Once again, in addition to the coloring of the safety strip, it is possible to give the various components invisible properties in order to provide the safety strip with further machine-detectable coding.

FIGS. 4 (g) and 4 (h) show the safety of three components divided into two layers A and B separated by a central region C and an outer region made of synthetic resin layers of different colors. The line is shown. For example, if the component of region A is red, the component of region B is white, and the component of region C is yellow, the safety stripes are red-white-yellow or the opposite color coding when viewed by incident light. Indicates. However, when viewed in transmitted light, the color coding is orange-white-orange.

Finally, FIGS. 4 (i) and 4 (j) show a safety line 12 whose inner region B has a circular cross section. Inner area B
Flows into the outlet of the extruder through an annular die.
Here, as in the other embodiments, it is possible to design the die into which the central component flows in to be movable. During the extrusion molding process, for example, if the die into which the components forming the central region B flow is pendulum-moved, the inner region B of the safety filament 12 meanders.

An alternative technique to coextrusion is to first make a plurality of single filaments and then combine them into a multi-component filament. This method also makes it possible to produce filaments having the above-mentioned properties with respect to the arrangement and the different physical properties and is thus suitable for producing the securities of the invention.

The synthetic resin filament extruded may be mixed with a specific extender pigment, coloring pigment, magnetic pigment, metallic pigment and / or soluble dye, if necessary, and used again as a single filament. preferable. As in the case of coextrusion, in this case too there are numerous possibilities to combine several single filaments made by different manufacturing methods to produce a safety filament divided into multiple zones. ..

FIG. 5 shows an apparatus for simultaneously producing several multi-component safety filaments consisting of different single filaments.

The differently colored components of the safety filament to be produced are separately produced by extrusion as single filaments 13, 14 and 15 having a circular or elliptical cross section and then wound on a spool.

The single filaments 13, 14, 15 have different physical properties which can be detected by the machine.

Then, these single filaments 13, 14, 1
5 are bundled into a multicolor strip, which is drawn out through a guide rail 16 and placed so as to come into direct contact with an endless carrier film 17 which constitutes a conveyor belt suspended between the direction changing rollers 18. And then adhered by the adhesive. In this case, it is important that the plurality of single filaments 13, 14 and 15 move in parallel on the carrier film 17 and adhere to the carrier film 17 in a state of being in close contact with each other.

Next, a plurality of single filaments 13, 14, 15
Is conveyed and the single filaments 13, 14, 15 are welded to each other at a high temperature by a laminating apparatus 20 such as an appropriate heat press to form a multicolor strip. The sets of single filaments 13, 14, 15 which are welded together to form one safety filament are formed by a plurality of division zones 19 having a considerably higher softening temperature than the multi-component safety filament to be manufactured. Separated from each other. Of course, the carrier film 17 must have the same thermal properties as the split zone 19. The plurality of safety filaments manufactured in this manner are laminated and then removed from the carrier film 17 and separately wound on a spool.

Synthetic resins such as Teflon and HOSTAFAN, which have a high softening temperature and a low affinity for the single filament used, are suitable as the carrier film 17 and the dividing strips 19. Each single filament 13, 14, 15 is preferably made from a polymer having a high affinity for one another and a low softening temperature, for example a polyamide-based copolymer, acrylate polyethylene or the like.

When a plurality of single filaments 13, 14, 15 are made of a non-laminated material, an adhesive layer is provided on these single filaments, or at least on the single filaments that have come inward later. Can be joined together.

An example of experiment in which various regions of the three-component safety wire are subjected to different doping treatments will be described below.

Experimental Example 1 A mixture of polymers such as Akzoplastic (Akzo
plastiks) Copolymerized polyamide "Akron"
(Akulon) "is distributed to three extruders to melt the particulate matter. Three weight percent europium-
Europium-tris [dibenzoylmethane (dibe
nzoylmethane)] is mixed with the melt of each component of the filament which will become the outer side, decomposed in the melt of polyamide, and uniformly distributed therein.

After extruding the safety filament, an area that appears as two side edge stripes that become fluorescent red when excited by ultraviolet rays and an area that appears as a central stripe that does not show any fluorescent color are formed. You can get the safety line you have. Further, various portions of the safety line may be colored with a visible dye or a pigment, in which case it is only necessary to ensure that the dye used is transparent in the range of fluorescence radiation.

Experimental Example 2 This experimental example is similar to Experimental Example 1 except that the two parts of the safety line are provided with substances of different characteristics. As the first coding component, for example, 3% oxazin dye series Nile blue
[Eastman, Flukka] is used with Lumilux from Riedel de Haen at a concentration of 4% as the second coding component.

In this way, for example, a safety line is obtained which has areas which appear as two side edge stripes which exhibit different fluorescent colors depending on the excitation method. When excited by visible light, Nile Blue emits fluorescence in the region very close to infrared, and when excited in the ultraviolet region, the second coding component emits green fluorescence.

Experimental Example 3 This experimental example is the same as Experimental example 1 except that coding is applied to all three regions of the safety line.

As in Experimental Example 1, 1% by weight of europium-tris [thenoyltrifluoroacetone] was mixed as a component of the region appearing as the two lateral stripes of the safety line, and the mixture was added to the center. 5% by weight of Lumogen light yellow LT (BAS) as a component of the area that appears as stripes
Mix with F). After extrusion, a safety line is obtained which, when exposed to UV light, exhibits a strong yellow fluorescence along its entire width. Also, the red fluorescence in the area that appears as two side edge stripes is not perceived by the human eye, but can be detected by a suitable detection device.

Experimental Example 4 This experimental example demonstrates that instead of the mixed europium compound added to the polymer mixture fed to the two outer extrusion dies, 5 weight percent of Bayer magnetic material is used. The same as Example 1 except that Pigment No. 8200 was used.

In this way, a multi-component safety filament having a magnetic field in the outer edge stripes can be obtained. In addition to the magnetic coding, the individual areas are again colored with visible dyes or pigments. In addition to the experimental examples described above, when the region that appears as the side edge stripes of the three-component safety filament is excited by ultraviolet rays, even if the emission can be measured in the infrared region, for example, it appears as a central stripe. It is also possible to dope it with a fluorescent substance that emits in the visible region, which lies exactly within the excitation spectrum of the fluorescent substance in the region. During the inspection, only the central region of the safety line is designated as the lateral edge fringes, except for the extraneous rays that may excite the central fringes, except for the UV light needed to generate the fluorescence. Care must be taken to expose the light rays generated by the flanking edge areas. Fluorescence emission in the central region is only excited by the lateral edge regions in such an examination, which confirms the required composition or desired fluorescence properties of the substance in the safety line.

Since the fluorescence emission of the first substance required to excite the second fluorescent substance is usually very weak, a good optical coupling between the various components is required for the mutual fluorescence excitation mentioned above. is necessary.

The co-extruded filaments are characterized by the fact that they are homogeneous bands and thus give a very good optical bond between the various components without the use of any additional binder. Being attached, strictly speaking, these filaments are very suitable for realizing the above experimental example. In the case of safety filaments produced by different methods, the lack of such a homogenous bond makes it impossible to achieve the desired result even with the use of suitable phosphors.

The securities (banknotes, identification cards, etc.) of the present invention are
As described above, the safety wire can be inspected for its authenticity or authenticity in various ways.

FIG. 6 schematically shows a preferred embodiment of the device for inspecting the safety line described in Experimental Example 1.
According to Experimental Example 1, it is the ternary filament where the lateral edge stripe contains the chelate activated by europium and the central portion is inactive.

The securities 37 (banknotes) with the safety line 4 passing through the inspection device at a constant speed are exposed to the rays of two tubular UV lamps 38 with black glass bulbs (eg Sylvania F4T5BLB). , The activated area of the safety line is excited to emit light. The reflecting mirror 39 amplifies the excitation intensity of the radiation so that the emitted light of the lamp 38 is separated into other components 40.
Works to block from 42 to 42.

The surface of the specimen is 1:10 by the lens 40 [eg Spindler &Hoyer; f (focal length) = 20 mm, φ (diameter) = 10 mm].
Striped silicon cell 4 with a width of about 1 mm
2 [For example, Hamamatsu S 875-16R] is reproduced. Thus, the inspection system is approximately 0 in the direction of movement of the specimen.
It has a resolution of 1 mm.

The emission radiation of the safety line passes through a narrow band-shaped optical filter (interference filter). With the pass band from 605 nm to 625 nm and the blocking of the spectral edge region from 200 nm to 1200 nm, the sensitivity of the optical arrangement is suppressed to a narrow range of the europium emission line, so that the sensitivity to ambient light is significantly reduced.

FIG. 7 shows the change over time in the emission intensity received by the sensor 42. The photodetector 42 is used to detect the luminescence that occurs during passage through the inspection device of the safety filament, for example having a lateral margin (europium chelate) with a total width of 0.8 mm and a width of 0.2 mm. The time interval t1 between the two peaks is 0.6 mm divided by the passage speed of the bill.

In this way, a specific physical (fluorescence)
The properties and the selective local presence of these physical properties in an area, as well as the spacing between these areas, serve as values for detecting the authenticity of the safety line.

In order to test the examples shown in Experimental Examples 2 and 3, the optical system of the excitation light source or the detector has to be adapted in each case to the particular fluorescence characteristic.

In order to inspect the magnetic safety wire described in Experimental Example 4, the security is passed through the magnetizing unit and then through the magnetic head. This magnetic head has the same structure as a magnetic head for an acoustic tape, and has a gap width between the heads of about 0.05 mm. With such a magnetic head, a high signal can be obtained that cannot be obtained even with a real acoustic head having a head spacing of ten times smaller.

The security wire-embedded securities are conveyed through the magnetic head, preferably in contact. The distance of the safety wire from the magnetic head must not exceed 0.1 mm because it is embedded in the security. The signals generated by the side edges of the inventive safety wire with the magnetic pigment are evaluated in the same way as in the experimental example.

As shown in FIG. 8, the inspection device preferably has a plurality of sensor heads arranged linearly with the safety line to be inspected. These sensor heads 43 to 45 are arranged on a common carrier 46 which is mounted perpendicularly to the banknote passing direction indicated by the arrow. In this way, when detecting the position of the bill using a suitable position sensor, it can be checked whether the safety line extends exactly parallel to its short side in the bill. The reason is that in this case all output signals appear simultaneously.

When bills are conveyed in an inclined state, output signals from various sensors appear over time (see FIG. 9). The resulting false distance measurement (the time interval T between the test signals increases and the spatial distance detected from it also increases) is determined by comparing the measured distance value with the data a, b over time. Can be corrected.

An inspection device suitable for inspecting a safety line having components with different physical characteristics has a plurality of sensor heads according to different characteristics, and the number of these sensor heads is at least that of the safety line. Equal to the number of components.

Each of these sensors is designed to detect one particular characteristic. If the sensors are on the line through which the safety line passes, the output signals of the sensors must appear at different predetermined times. By assessing the appearance of different signals over time, it is possible to determine the structure, position and distance between different components.

For example, in the case of inspecting a three-component safety filament in which the side edge region is fluorescent and the central region is fluorescent yellow as in Experimental Example 5, as shown in FIG. Four
Advantageously, 5 is arranged to detect red fluorescence while sensor 44 detects yellow fluorescence. In addition to the distance measurement between the lateral fringes mentioned above, the specific fluorescence of the central fringe can also be inspected in this way.

If only the decay time of the fluorescent material of the central stripe and the side edge stripes is different, their collapse time can be examined by laterally displacing either sensor in the passage direction of the bill. .. For example, a light emitter with a short decay time is selected for the central stripe, and a light emitter with a long decay time is selected for the side edge stripes. In the inspection device as shown in FIG. 8, the sensors 43 and 45 are moved laterally so that when the safety line passes through these sensors, the emission of the central stripe has already collapsed. In this way, the sensor 44 provides a signal representative of the measurement of the full width of the safety line, while the sensors 43, 45 can determine the distance between the lateral edge stripes, i.e. the width of the central stripe, shown in FIG. Give a signal.

In the security inspection or sorting apparatus of the present invention,
It is possible to use two or more detection devices as shown in FIG. 8, in which case for example one is designed to detect the visual design of the safety line, eg the colored state while the other is The presence of invisible physical properties in various regions may be detected.

Other component filaments consisting of a plurality of single filaments or produced by coextrusion are also subjected to additional treatment (coating, evaporation, printing, etc.) and then used for securities in various ways. be able to. Since the various components of the safety strip of the invention are preferably of different colours, it is advantageous to embed the safety strip in such a way that at least part of it is visible. In this case, the safety line may be put into the security by the method as described in West German Patent 341,870 or West German Patent 274,319.

In the case of an identification card consisting of a plurality of synthetic resin layers, a safety line is usually buried under a transparent cover layer so that it can be completely seen over its entire length. Is good. As the safety wire, it is preferable to use a synthetic resin having a softening temperature higher than that of the constituent material of the card layer. The card layers can be fused together by conventional heating and pressing without damaging the safety lines.

If the material and the laminating process are adjusted to each other so that only the surface area of the safety line is softened during the laminating process without impairing the characteristics of the safety line according to the present invention, the A strong bond can be obtained between the adjacent synthetic resin layers.

It is known to insert highly secure securities inlays into these cards in order to enhance protection against counterfeiting of synthetic resin cards, but using the securities of the present invention in which other component safety wires are embedded. As a result, the protection against the forgery of the configuration including the conventional securities inlay can be further enhanced.

[0080]

As described above, according to the present invention, the security line is passed by the sensor only by passing the security through the inspection device in a state where the security line is perpendicular to the conveying direction. By detecting the physical characteristics of each area and further detecting the change over time in the detection signal from the sensor, it is possible to know the physical characteristics of each area and the geometrical positional relationship such as the width and spacing of each area. Therefore, the authenticity of the securities can be quickly and surely determined.

[Brief description of drawings]

FIG. 1 is a plan view of a security to which an inspection method of the present invention is applied.

2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a cross-sectional view of essential parts showing an example of a shared extrusion molding head.

FIG. 4 (a) to FIG. 4 (j) are cross-sectional views and partial side views showing examples of various cross-sectional structures of the safety wire to be inspected by the inspection method of the present invention.

FIG. 5 is a plan view showing a laminating apparatus for manufacturing the safety filament of the present invention.

FIG. 6 is a diagram showing an inspection apparatus for detecting the authenticity of a security according to the present invention.

FIG. 7 is a graph showing a change with time of an inspection signal.

FIG. 8 is a plan view showing a further advantageous embodiment of the inspection device.

FIG. 9 is a graph showing a change over time of an inspection signal when a security is conveyed in an inclined state.

[Explanation of symbols]

 1 Securities 4 Safety Lines A, B, C Areas

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Gerhard Schvenk Germany, Germany 8039 Puchheim, Edelweissstrasse 20 (72) Inventor Gerhard Stenzel Germany, Germany 8000 München 2, Schiestestraße 6

Claims (4)

[Claims] 1. A security in which a safety wire having a specific physical property which can be visually confirmed by both reflected light and transmitted light and which can be detected by a machine is embedded in the security wire. The strip is divided into at least two adjacent regions extending in its longitudinal direction, each region extending over the entire length of the safety line and arranged parallel to each other with respect to the face of the security. Are visually identifiable, and have mutually different physical properties that can be detected by a machine, and the regions arranged in parallel are arranged in a geometrical positional relationship by a predetermined shape arrangement, This predetermined geometrical positional relationship can be visually confirmed or configured so that it can be measured without destroying the security by a detection signal detected based on the physical characteristics of each region. A method of inspecting a security in which a safety wire is embedded, wherein the security wire is passed through an inspection device at a constant speed and in a state in which the safety wire is perpendicular to the transport direction. Detecting the physical properties of each area of the safety wire and their changes over time using one or more sensors as they pass through the security inspection device; and various areas of the security wire. A step of determining a geometrical arrangement of those regions based on an inspection signal coming from and comparing it with a predetermined value; 2. The physical characteristics of various regions of the safety wire are detected by using a plurality of sensors arranged on a line parallel to the safety wire. Inspection method for securities with the stated safety line embedded. 3. A step of confirming the position of the security by using a position detector when passing through the inspection device for the security; a predetermined process using at least two sensors capable of detecting the same physical characteristic. Determining the presence of a physical property of the sensor; comparing the appearance over time of the test signal provided by the sensor with a predetermined value in relation to the signal provided by the position detector. A method for inspecting a security in which the safety line according to claim 2 is embedded. 4. The step of confirming the presence of a given physical property using at least two sensors capable of detecting the same physical property; the temporal sequence of test signals coming from said sensors being different. 3. The method of claim 2, further comprising: generating a correction signal; and including the correction signal in determining various geometries of the safety line. Inspection method for securities with safety lines buried in.